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K
2
Cr
O
4
+
Pb
2+
→
Ø
This reaction
does not occur
under the normal conditions, because
K
+
is more reactive than
Pb
2+
. The reaction should go in the reverse:
K
2
Cr
O
4
+
Pb
2+
←
Pb
Cr
O
4
+
2
K
+